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Now that I've finished updating all the PSL files, I've moved all the PSL files back into the normal examples folder.

Moved Amended-Needham Schroeder into done_examples (temporary measure until all of the example theories have been properly converted into the latest Maude-PSL version). Also removed Amended-NS which was just a differently named file of the same protocol as Amended-Needham-Schroeder, and therefore not necessary.

Initial commit to the public repository. Contains all the files needed to run Maude-PSL, as well as an examples directory, and a directory of the original npa-examples for use of comparisions with the Maude-PSL examples. Also contains a pdf file containing a description of the language.